@Pakpoom Did you dump the first two batches and not try to add more yeast to the failed batches to start them back up? That way we would know for sure if the yeast was dead for some reason.
There is no reason at all it should not be brewing correctly if everything is in there and at that temperature, as that is the perfect range for a bavarian wheat beer. Even with NO iGulu machine at all, the kits should be working fine for you as long as the temperature range if correct.
The only reason at all that would cause what you are seeing is dead yeast, or a yeast that has refused to start properly, so in your case, if it does not start fermenting, I would just spend a few dollars on amazon and buy some yeast and test if that is the issue. All the other ingredients will work with essentially any yeast at all. Each type of yeast will of course effect the flavor of your final product, and how dry it is, but everything else should work just fine as ingredients with any yeast at all. You could literally go to the store and buy bakers yeast for bread and even that would brew you beer without an issue, though I would recommend getting an actual yeast like I mentioned in an earlier post. I posted a direct link to a yeast for you two posts ago. Just click on the word "here", where I said "So you can buy a yeast such as this Bavarian Wheat yeast sold here on Amazon".
You should absolutely email their support as well and let them know that you have had two batches completely fail to ferment, and that you have started a third batch, and you have the same issue. Let them know exactly what you have done, that you followed the directions exactly, that the iGulu itself is in fermenting mode and the temperature is being maintained correctly, and that there are no bubbles, and no increase at all in Co2. That once the process was finished you ended up with sweetened water instead of beer.
They will reply to you with support, and most likely send you replacements. Not sure if they will ask for pictures or anything, but support from their actual support email has always been excellent for me. While we can answer questions for you on this forums, as other owners of the product, to try to help you out, we cant give you actual support for your wasted batches. It sounds like you did absolutely nothing wrong if you left nothing out of your posts, and you received some bad beer kits, so you should definitely email them and let them know to get replacements sent to you. They will not help you here on the forums at all. You have to actually email them. You can use their Contact Us form on their web page or directly email them at support@igulu.com.